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The application of perturbation theories for exchange forces to a simple model

✍ Scribed by S.T. Epstein; R.E. Johnson

Publisher
Elsevier Science
Year
1968
Tongue
English
Weight
222 KB
Volume
1
Category
Article
ISSN
0009-2614

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✦ Synopsis

Several recently proposed perturbation theories of intermolecular forces including exchange are appiied to an e.xactly soluble spin model.

zntuodmtion

In the recent literature'

[l-6] there have been many methods proposed for obtaining a useful perturbation theory of intermolecular forces including exchange. In this note we report the results of applying several of these methods to a simple soiuble model.,

The model

For two non-interactim spins in a magnetic

We have applied the following theories to the (symmetric) ground stat? :>f 'this model: Hirschfelder and Silbey (HS) **, A_ Van der Avoird [2] (AV) ***, L. Jansen [4] (L.J.)t, Musher and Amos [5] (MA) t-i, Murrell and Shaw [S] (MS)?'??, the polarization approximation (Pal.

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